Japan Flora: Deciduous tree with terete branches brown-pubescent while young; leaves rather large, the leaflets 7-15, sessile, lanceolate to narrowly ovate, 4-10 cm. long, 1-3 cm. wide, long-acuminate, doubly serrate, loosely brown pubescent at first, soon glabrous except in the axils of the nerves beneath; aments few to several at the summit of the young branchlets, erect, the terminal aments pistillate, 3-4 cm. long, 2-3 cm. across, ellipsoidal, with dark brown, linear-lanceolate, coriaceous, acuminate scales; fruit about 5
mm. long, glabrous, obtriangular inclusive of the wing; staminate aments borne laterally below the pistillate; June-July. Mountains;

Honshu, Shikoku, Kyushu. Korea, China, and Formosa.